Nonlinear Analysis And Damage Development Of The High-pile Wharf Earthquake Response

China is a big ocean country with a vast coastline,and the port terminal has a great influence on China's economic and social development.The high-pile wharf,as an important link between ocean and land transportation,has attracted extensive attention in engineering and academic circles.Seismic research of many scholars of the high-pile wharf,focused on the analysis of the mechanical characteristics of wharf structure and displacement response,to explore the wharf under earthquake load over time.While the damage evolution process is still in a blank state.At the same time,the deterioration of concrete carbonization and steel corrosion in the high-pile wharf caused by the erosion of sea water has resulted in the decline of the overall force performance of the high-pile wharf.Therefore,it is of great significance to study the seismic capability of the high-pile wharf in corrosive environment under the action of seismic load.This paper has researched the damage evolution and ultimate damage mode of the high-pile wharf under seismic load through the establishment of the nonlinear finite element model of high-pile wharf by using Drucker-Prager soil constitutive model,embed technology composite reinforced concrete model and elastic-plastic time-history analysis method.By introducing the concept of tensile and compressive damage factors into the model,this paper has elaborated the development process of the tension and compression damage of the high-pile wharf with earthquake and presented the seismic weak link of the high-pile wharf effectively.Meanwhile,the finite element model is established considering corrosion of the high-pile wharf,reveals the performance of wharf and damage and seismic evolution under the influence of uniform corrosion and splash zone corrosion,provide a valuable reference for the seismic optimization design of the high-pile wharf structure.The main conclusions of this study are as follows:(1)The plasticity damage model can better simulate the damage distribution and damage evolution process of the high-pile wharf under seismic load.Damage are mainly concentrated in location of the pile cap and the surface of the pile with the soil.In the impact of the earthquake load,the position of the near soil side pile cap firstly began to damage and gradually developed from the lateral side of the soil to the far side of the soil.The damage occurred on the surface of the pile with the soil later than the pile cap,and the development law was also described as from lateral side of the soil to the far side of the soil.The closer to the soil side pile,the more serious the damage was.(2)The high-pile wharf damage degree and damage time history curve of each unit will change under different seismic wave loads,but the distribution of damage location and damage evolution process and damage of typical units of order remains the same.When the high-pile wharf is in weak earthquake intensity,the damage is first occurred in the position of the near soil pile cap.As the earthquake intensity increases,the damage is gradually developed from the near soil side pile to the far side pile.(3)With the increase of the corrosion rate of the steel bar section,the stress distribution and damage distribution range of the high-pile wharf will be significantly expanded,and the displacement response of the structure will be larger.Nonlinear dynamic damage analysis results of pile splash zone corrosion and pile uniform corrosion of the high-pile wharf show that the pile splash zone corrosion will lead to the damage evolution rule of the high-pile wharf and the damage distribution location changing.